Miller, 29, has posted a 2.34 ERA (42.1IP, 11ER) with 13 walks and 69 strikeouts in 50 appearances for Boston this season. He has held left-handed hitters to a .150/.203/.217 line in 65 plate appearances, while keeping righties to a .180/.279/.258 line in 105 plate appearances.

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Miller ranks fourth among major league relievers this season, striking out 14.67 per 9.0 innings. His 5.31 strikeout-to-walk ratio ranks 17th.

Since becoming a full-time reliever in 2012, Miller has pitched to a 2.78 ERA (113.1IP, 35ER) in 140 games, striking out 13.3 per 9.0 innings.

Rodriguez, 21, is 3-7 with a 4.79 ERA (82.2IP, 44ER) in 16 starts for Double-A Bowie this season.